For this year's SCA 2020 (The 19th annual symposium on computer animation), the VISUS publication "Efficient 2D Simulation on Moving 3D Surfaces" by Dieter Morgenroth, Stefan Reinhardt, Bernhard Eberhardt, and Daniel Weiskopf was accepted.
The SCA will take place online this year from October 6 to 9 2020. The SCA is the most important forum for innovations of software technologies in the field of computer animation.
We present a method to simulate fluid flow on evolving surfaces, e.g., an oil film on a water surface. Given an animated surface (e.g., extracted from a particle-based fluid simulation) in three-dimensional space, we add a second simulation on this base animation. In general, we solve a partial differential equation (PDE) on a level set surface obtained from the animated input surface. The properties of the input surface are transferred to a sparse volume data structure that is then used for the simulation. We introduce one-way coupling strategies from input properties to our simulation and we add conservation of massand momentum to existing methods that solve a PDE in a narrow-band using the Closest Point Method. In this way, we efficiently compute high-resolution 2D simulations on coarse input surfaces. Our approach helps visual effects creators easily integrate a workflow to simulate material flow on evolving surfaces into their existing production pipeline.